Thermostat.



W. W. DEA1\L THERMOSTAT.

APPLICATION FILBD MAY 29, 1905.

1 956,638, Batenzed Mai: 18, 1913.

. two foreach ear.

UNITED STATES PA lEN T OFFICE.

WILLIAM W. DEAN, OF ELYRIA, CHIC, ASSIGNOR TO THE CONSOLIDATED FIREALARM COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

THERMOSTAT.

Specification of Letters Patent.

Patented Mar. 18, 1913. Application filed May 29, 1905.

Serial No. 262,915.

1'o all w/ wm it may conccm Be it known that I, VV1LLIAM W. DEAN, acitizen of the United States, residing at Elyria, in the county ofLorain and State of Ohio, have invented certain new and useful Imrovements in Thermostats, of Which the foll%wing is a specification,referenoe being had therein to the accompanying drawing.

y invention relates to thermostats and released. more especially to theopen circuit class. It Wlll be evi dent that the spiral spring Theobject of the invention is to providea may be placed in the depressedportion of thermostat for automatic electric fire alarm one to Whichsystems, Which will be reliable, efficient and positive in action.

the opposite member from the it 15 110W shown attached.

As Will be seen by inspection of Fig. 3 the.

A further object is to se construct the members 3 and 4 are normallyseparated thermostat that there Will be no danger of from each other.VVhen, however, the teman accidental alarm being sounded, Therperaturein the room in which the thermomostats with their movable parts composedstats are located rises above a given degree, of metals having ditterentcoefficients of eX- the metal on the inside of the terminal mempensionare difliult to keep in adjustment, bers fuses and releasesthe spring sothat it- Will contact with the opposite terminal mem bers and thoroughlyincorporate itself in the now soft metal 11. This action will close thecircuit and ring the alarm.

Having thusdescribed my invention what I daim and desire to secure byLetters Patent is:

1. In a thermostatic circuit doser, the combination with a pair ofcircuit terminals having anarrow space between them, of an insulatingring normally separating said terminals, a tapered spiral spring betweenthe terminals and having a tendency to rise in conical form to itselfconnect the two ter minals and means normally holding said spiral springpressed with all of its turns in the same plane on one of saidterminals, said holding means being adapted to release said spring uponbeing subjected to a predetermined temperature.

2. In a thermostat, the combination with two fixed contact members oneof which is provided with a raised portion, the other of Which isprovided with a depression, of an and liable to sound accidental alarmeby reason of vibrations caused by shock or otherwise.

Further objects Will appear as the specification is read in connectionwith the acompanying drawings.

The invention consists in the novel features and combination of partswhich Will be described hereinafter and partieularly pointed out in the.appended claims.

In the drawings, Figure 1 is a top perspective view; Fig. 2 a bottomperspective view;.Fig. 3 a longitudinal section showing the springcontracted; Fig. 4 a detail perspective of the insulating member; andFig. 5 is 9. section similar to Fig. 3 but showing the spring distendedand the metal retainer fused, etc.

Referringto the drawings, 1 represents a suitable insulating base orplate Which is provided on its upper side with spacing lugs 2 adapted tokeep the device a sufiicient distance from the ceiling or Wall. Securedto each side of the insulating latte 1 are termina] members 3 and 4, theormer of Which insulating plate separating said members, is providedwith a depressed central portion fusible material connected to each ofsaid 5 and the latter of which is provided with a members, a spiralspring normally held comraised central portion 6. Each of these pressedin the fusible material of one of said members 3 and 4 is provided with.cars 7 to members but adapted to be releasedupon a which are secured theusual binding posts 8, temperature sufficient to fuse said material Theterminal member 3 is and to Incorporate itself in provided with a spiralspring 9 of conical the fusible maformation which is held collapsed uponthe 3.

formed by the depression The spring raised portion 10 5), by an easilyfusible metal 11 a plurality 'of terminal and fiat on one of said platesbut terminals, fusible conducting material on both of said terminals anda spring embedded in said fusible material on one of the terminals andadapted at 1 predetermined temperature to be release an effect contactwith the other terminal.

7. A thermostatic circuit closer comprising a pair of circuit.terminals, an insulating plate separating said terminals, fusibleconducting material on each terminal, and a spiral spring normally heldcompressed upon normally separate said members, and pr0- separating saidvided with an aperture, lugs on said plate adapted to space the plateaway from the support on which it rests, fusible material on saidmembers, and a spiral spring embedded in the fusible material on one ofsaid members and adapted to bridge and connect said members through saidaperture when released from the fusible mate rial.

4. A thermostatic circuit doser compris ing independent terminal membershaving a narrow space between them, insulating means holding saidmembers apart from each other, and a conical spiral spring between themembersnormally held fiat against 011e member by fusible means embeddingits coils, but adapted to be released at a predetermined temperature andthereupon to project its coils in conical shape so as to itselfelectrically connect the members.

5. A thermostatic circuit closer comprising independent terminal plateshaving a narrow Space between them, an apertured insulating diskseparating said plates, and resilient means normally held between themadapted at a predetermined temperature to be released and to expandperpendicularly so as to itself one terminal by said fusible mater1a,adapted to be released at a predetermined temperature and thereupon t0malte contact with the fusible material upon the other terminal.

8. In a thermostatic circuit doser, the combi nation with a pair ofparallel disk terminals of relatively thin metal, insulating materialspaCihg said terminale apart, and forming an inclosed chamber betweenthem, fusible material in a thin layer on the inner face of one of saiddisks, and a spring confined by said fusible material and adapted toeffct contact with the opposite disk termina In testimony whereof Iafiix my signature in presence of two witnesses.

I WILLIAM W. DE AN.

brid e said plates through the aperture in the isk. VVitnesses:

G. A thermostatic circuit doser, compris SIDNEY A. BEYLAND, ing twocircuit terminals, insulating means M. E. MIZER.

1 but-

